Imagetrace Script / doesn't recognize options / wtf preset number

I'm totally desperate because I need to get an imagetracing script to work and it somehow just won't.
Here's the deal. I need to adjust the options for the trace command. There are 2 ways:

1) adjust the preset number and load it from the Application.tracingPresetList
array:
Well I tried presetnumber 1 to 25 and they load the default imagetrace presets but there is no way I could figure out to load my custom made presets. Since I don't know where to find the presets or don't know how to display what presets there are, it kinda sucks bigtime. Maybe there is a way to write a custom preset in the array and then simply load it with my script?

2) set the tracingoptions right in the script:
and here is where my lack of java knowledge bugs me. I spent hours and hours browsing through code and read the javascript object reference but somehow illustrator just ignores my code. I guess it's a pretty simple job for someone who knows java. Here is the link to the reference guide. Tracing is starting at page 230 http://www.adobe.com/content/dam/Adobe/en/devnet/pdf/illustrator/scripting/...

Here comes the code. The bold part is where the options are set (or not..) and the commentary line is the preset part from option 1.
If someone could help me out. It's a biggie to me I will gladly buy you a case of beer, make you a video or whatever suits you. I'm realy loosing it, so please help!